SID 1545: DOS Cisco attempt

["D PH" <flying_triguy () hotmail com>]

Hey all, running into a bit of a wall, I can't find out what vulnerability 
this rule applies to. There is no CVE, CERT or Bugtraq information in it.

I am seeing a few of these every now and then on my external interface of a 
class C and before I comment it out as being not applicable to me, I would 
like to know what vulnerability it is. I can't figure it out unless it is 
mis-named. It is looking for a 1 byte packet destined for a web port with 
0x13 as the only byte.

The rule was promoted out of Experimental rules and into dos.rules, but I am 
at a loss as to what it means.

dos.rules:alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS 80 (msg:"DOS cisco 
attempt"; flow:to_server,established; content:"|13|"; dsize:1; 
classtype:web-application-attack; sid:1545; rev:4;)

Any ideas? Any hints? I can't even tell if I should be looking for CISCO DoS 
information or web-app vulnerabilities.

DP

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